Bolt, 5/16in x 13/16in x 26tpi, set screw, zinc plated. BSCY / CEI with slightly domed head, 1/4BSF (7/16AF) head. Norton AJS matchless Triumph style pre 1960s. Original part number: 8870; A2/68 - Exhaust valve lifter lever securing bolt E3135 - featherbed centre stand fixing strap bolt; Oil Tank Bottom and Battery Carrier Attachment Bolt